Increasing order of EAN of the metals in $[N i (C N)_{4}]^{2 -} [F e (C N)_{6}]^{3 -}$ and $[C u (C N)_{4}]^{3 -}$ is:

[N i (C N)_{4}]^{2 -} < [F e (C N)_{6}]^{3 -} < [C u (C N)_{4}]^{3 -}

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[N i (C N)_{4}]^{2 -} > [F e (C N)_{6}]^{3 -} < [C u (C N)_{4}]^{3 -}

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[N i (C N)_{4}]^{2 -} < [C u (C N)_{4}]^{3 -} < [F e (C N)_{6}]^{3 -}

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[C u (C N)_{4}]^{3 -} < [F e (C N)_{6}]^{3 -} < [N i (C N)_{4}]^{2 -}

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Solution

The correct option is D $[N i (C N)_{4}]^{2 -} < [F e (C N)_{6}]^{3 -} < [C u (C N)_{4}]^{3 -}$
EAN= [Z metal – (ox. state of the metal) + 2(coordination number of the metal)].

EAN value of complexes
$= 28 - 2 + 8 = 34$
$= 26 - 3 + 12 = 35$
$= 29 - 1 + 8 = 36$

The order is 1 < 2 < 3.

Option A is correct.

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